Effect of ring dynamics and crevice flows on unburned hydrocarbon emissions

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of Engineering for Gas Turbines and Power; (United States)

DOI:https://doi.org/10.1115/1.2906886· OSTI ID:6656819

Shih, L K; Assanis, D N ^[1]

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1. Univ. of Illinois, Urbana, IL (United States). Dept. of Mechanical and Industrial Engineering

A significant source of unburned hydrocarbon emissions from internal combustion engines originates from the flow of unburned fuel/air mixture into and out of crevices in the piston-cylinder-ring assembly. During compression, fuel vapor flows into crevice regions. After top dead center, the trapped fuel vapor that returns into the cylinder escapes complete oxidation and contributes to unburned hydrocarbon emissions. In this work, the crevice flow model developed by Namazian and Heywood is implemented into KIVA-II, a multidimensional, reacting flow code. Two-dimensional, axisymmetric simulations are then performed for a 2.5 liter gasoline engine to investigate the effects of engine speed and selected piston-ring design parameters on crevice flows and on unburned hydrocarbon emissions. Results suggest that engine-out unburned hydrocarbon emissions can be reduced by optimizing the ring end gap area and the piston-cylinder side clearance.

• OSTI ID: 6656819
• Journal Information: Journal of Engineering for Gas Turbines and Power; (United States), Journal Name: Journal of Engineering for Gas Turbines and Power; (United States) Vol. 116:4; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330704* -- Emission Control-- Hydrocarbons
AIR POLLUTION CONTROL
COMPUTERIZED SIMULATION
CONTROL
ENGINES
FLOW MODELS
HEAT ENGINES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
POLLUTION CONTROL
SIMULATION